qcacld-3.0: BTM changes to add new WCNSS_qcom.ini to configure btm params

Add the following new WCNSS_qcom.ini value:
"prefer_roam_score_for_candidate_selection" - choose to sort the
candidates on roam score or preferred AP list send in the BTM
request frame by AP.
When this ini is set, host driver will
modify btm_offload_config bit 7 which will be read by firmware
to get this ini value.

“roam_candidate_validity_timer” - roam cache entries validity
timer. The candidates in the roam cache are valid only for this
time value. This value is sent to firmware over the wmi command
on the structure wmi_roam_offload_tlv_param

"btm_disassoc_timer_threshold" - Disassociation timer threshold
to wait after which the full scan for roaming can be started
after the AP has sent the disassoc imminent

Change-Id: I3ba5ba2182b1b6d722d9c315757332a1b3e62521
CRs-Fixed: 2369018
7 files changed